Suppose you lose the bag containing your laptop along with its accessories or while travelling the police confiscate all your computer devices, can you safely use all the devices again if you format all your devices and wipe all the data?
How far should you go at the software level? Would formatting the hard drive be enough or should you rewrite the BIOS also if it's editable for your laptop? And for other devices such as usb drives, external hdds, routers, and mouse? Can you use them again safely? Could they change the usb firmware for example?
And what about the hardware? Should you be worried about that? I have read laptops are hard to modify but I think you can still modify them. Modifications such as installing a keylogger.
So the question is, can these devices software and/or hardware be modified? If yes, then can you reverse the changes and how far should you go to be sure that the device is completely safe?
2) External HDDs or SSDs
3) USB drive
Most people don't have the skills required or time to do more than format their HDDs. Is the answer that you can't be sure that your device is clean after an incident like this? I am sure many countries border police have got the resources to do whatever can be done with electronics.